* {
	padding: 0;
	margin: 0;
	list-style: none;
}

.tab {
	width: 300px;
	height: 300px;
	border: 1px solid red;
	margin: 100px auto;
}

.tab input {
	width: 100px;
	float: left;
	height: 30px;
}

.tab .active {
	background: red;
	color: #FFF;
}

.tab li {
	width: 300px;
	height: 270px;
	background: blue;
	font-size: 100px;
	text-align: center;
	line-height: 270px;
	color: red;
	display: none;
}

.tab .show {
	display: block;
}

.tab section {
	overflow: hidden;
}

#tab3 {
	position: relative;
}

.wrapper #oSp1,
#oSp2 {
	width: 30px;
	height: 30px;
	border-radius: 50%;
	color: #fff;
	display: inline-block;
	background: darkred;
	line-height: 30px;
	text-align: center;
}

#oSp1 {
	position: absolute;
	left: -30px;
	top: 100px;
}

#oSp2 {
	position: absolute;
	left: 300px;
	top: 100px;
}